Easiest thing to do is to spawn at the East zone and go to the Egg-Straction mission. Then, take the first left in the cave and you should end up by the nest. A good strategy is to wait until there aren’t any magmasaurs by an egg, then ask HLNA to teleport away, and right before you teleport, grab the egg.
so first thing u want to do is go to fjordur and get roughly 50 blood packs as you will most likely get picked up by multiple desmodi as you will need to tame one one you get a high lvl one with high stamina you will then need to craft a whip once u get into the cave and do this on lost island you then need to wait till night then go invisible once invisible fly to an egg with not many magmasaurs nearby once u get to it equip ur whip and take it and instantly get out of there as they will all be aggrod when your getting out make sure to fly higher up for more time to evade searing spit and bam you got out with shitty lvl 20 magmasaur eggs and you wasted your time.
On fjordur is you go into the cave at the end of the fire wyvern trench and fly to the nests steal one egg then lead the rest of the magmas under the bridge in that area lead them against the right wall going in with the spikes when there all in there enjoy getting all the other eggs in that area I got lots of eggs doing this
I’ve found the eggs. The eggs are located inside the volcano in an amethyst cave. There are lava pools with groups of magmasaurs in them. There are small islands with craters in them, within those craters the eggs are nestled within. But be careful there are lots of magmasaurs, magma, and what look like varient rock elementals.